257755081 has 2 divisors, whose sum is σ = 257755082. Its totient is φ = 257755080.

The previous prime is 257755079. The next prime is 257755087. The reversal of 257755081 is 180557752.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201640000 + 56115081 = 14200^2 + 7491^2 .

It is a cyclic number.

It is not a de Polignac number, because 257755081 - 2¹ = 257755079 is a prime.

It is a super-2 number, since 2×257755081² = 132875363562633122, which contains 22 as substring.

Together with 257755079, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (257755087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128877540 + 128877541.

It is an arithmetic number, because the mean of its divisors is an integer number (128877541).

Almost surely, 2^257755081 is an apocalyptic number.

It is an amenable number.

257755081 is a deficient number, since it is larger than the sum of its proper divisors (1).

257755081 is an equidigital number, since it uses as much as digits as its factorization.

257755081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 98000, while the sum is 40.

The square root of 257755081 is about 16054.7525985298. The cubic root of 257755081 is about 636.4081680717.

The spelling of 257755081 in words is "two hundred fifty-seven million, seven hundred fifty-five thousand, eighty-one".